H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 11/06 (2006.01)
Patent
CA 2084011
ABSTRACT A communications system includes at least two telephone subscriber locations interconnected by a public switched telephone network. A computer is located at each telephone subscriber location and is connected to the network via a conventional modem and a telephone line. A telephone or other telephone device such as a facsimile machine is also located at each telephone subscriber location and shares the telephone line with the computer. The computers are operable to establish a data session and transmit data messages therebetween when a communications link is established. A communications protocol in each computer gives priority to incoming calls directed to the telephone which are announced by the arrival of a call waiting tone during the data session. When such a tone is received, the computer terminates the data session and allows the telephone to ring in response to the incoming telephone call. The communications protocol also gives priority to the telephone device at each location by terminating the data session when the telephone goes off-hook. If a data session is terminated, the computer which initiated the data session reestablishes the communications link and resumes thedata session at the point where the data session was terminated. Thus, the communications protocol allows a computer to share an existing telephone line with a telephone in a manner which does not disturb the regular usage of the telephone line.
Rodman William
Wierzbica Ted
Mccarthy Tetrault Llp
Softscribe Corporation
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